MVC 下拉列表未绑定到模型
我正在尝试设置一个简单的下拉列表，但我似乎无法将其绑定到模型。 我正在使用 Asp.Net MVC 和 nhibernate。
我的下拉列表声明如下：
<%= Html.DropDownListFor(model => model.Project, (IEnumerable<SelectListItem>)ViewData["Projects"], " -- Select -- ", new { name = "Project" })%>
我像这样设置选择列表：
ViewData["Projects"] = new SelectList(projectRepository.GetAll(), "EntityGUID", "Name", editEntity.Project);
这似乎将选择列表绑定到下拉列表，但未设置 SelectedValue。 它显示为默认值 --- 选择 ---
另外，当我保存此数据时，下拉列表不会绑定到模型，我必须像这样手动设置对象才能保存它：
entity.Project = projectRepository.GetById(new Guid(Request["Project"].ToString()));
我相信我已经采取了正确的措施将此项目直接绑定到我的模型。 我在这里缺少什么吗？
非常感谢您抽出时间， 杆
I am trying set up a simple dropdown list but I dont seem to be able to get it to bind to the Model.
I am using Asp.Net MVC and nhibernate.
My dropdown list is declared like so:
<%= Html.DropDownListFor(model => model.Project, (IEnumerable<SelectListItem>)ViewData["Projects"], " -- Select -- ", new { name = "Project" })%>
I set up the select list like so:
ViewData["Projects"] = new SelectList(projectRepository.GetAll(), "EntityGUID", "Name", editEntity.Project);
This seems to bind the select list to the Dropdown fine, but the SelectedValue is not set.
it shows up as the default --- Select ---
Also when I save this data, the dropdown does not bind to the model, I have to manually set the object like so to save it:
entity.Project = projectRepository.GetById(new Guid(Request["Project"].ToString()));
I believe I have take the correct messures to have this item bind directly to my model.
Is there something I am missing here?
Many thanks for your time,
Rod
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天哪，我发现了问题........
我花了3天时间才把：
变成：
model.Aspect**.EntityGUID**
我必须将下拉菜单绑定到对象 guid，而不是对象本身。
Doh....我感到痛苦，还有很多工作要做。
感谢您抽出时间。
OMG I found the problem........
It has taken me 3 days to turn:
into:
model.Aspect**.EntityGUID**
I had to bind the drop down to the objects guid, not the object itself.
Doh....Im feeling the pain, much work to catch up on.
Thanks for your time.
这只是一种预感，因为您的代码对我来说看起来不错，但我认为您在定义
SelectList时不需要包含第四个参数。设置该字段可能会扰乱事物的正常流程（覆盖您的模型绑定），并且我从未绑定过 DropDownList 并拥有 SelectList 的 SelectedValue代码>设置。尝试删除它，看看效果如何。
另外我不久前问了一个问题有关如何在 MVC2 中实现 DropDownList 的信息，您可能会觉得有用。
This is just a hunch since your code looks good to me but I don't think you need to include the forth parameter when defining your
SelectList. Setting that field might be distrupting the normal flow of things (overriding your model binding) and I have never bound aDropDownListand had theSelectList'sSelectedValueset.Try removing that and see how it goes.
Also I asked a question a while back regarding how to implement
DropDownListin MVC2 that you might find useful.